Tough and Multi‐Recyclable Cross‐Linked Supramolecular Polyureas via Incorporating Noncovalent Bonds into Main‐Chains

• DOI: 10.1002/adma.202000096
• Publication Date: 2020-07-24T04:35:41Z
• Authors: Bo Qin; Shuai Zhang; Peng Sun; Bohan Tang; Zihe Yin; Xiao Cao; Quan Chen; Jiang‐Fei Xu; Xi Zhang
• Keywords: Supramolecular Polymers; Non-covalent interactions

Covalent thermosets generally exhibit robust mechanical properties, while they are fragile and lack the ability to be reprocessed or recycled. Herein, a new strategy of incorporating noncovalent bonds into main-chains is developed construct tough multi-recyclable cross-linked supramolecular polyureas (CSPU), which prepared via copolymerization diisocyanate monomers, noncovalently bonded diamine monomers linked by quadruple hydrogen bonds, covalent diamine/triamine monomers. The CSPU remarkable solvent resistance outstanding properties owing cross-linking triamine monomer. Through incorporation 9.7% 14.6% monomer, transparent films endowed with superior toughness 74.17 124.17 MJ m-3 , respectively. Impressively, even after five generations recycling processes, can recover more than 95% their original displaying excellent multiple recyclablity. As result, toughness, resistance, high transparency, recyclability well-combined in CSPU. It highly anticipated that this line research will provide facile general method various polymer materials properties.